My sister said she has had these skin problems and every-time the sun hits it or she starts sweating, they start irritating her skin in the same spot. I suggested it might be a hookworm because of the photo or skin cancer from the sun, but I'm trying to see if it's something different than that. Obviously, she needs to see a dermatologist, but is there any ideal that you guys might think what it is?
None of them are open wounds, so I don't think there contagious. They seem to be isolated on both shoulders in the same fashion.